diff --git a/contracts/ownership/Ownable.sol b/contracts/ownership/Ownable.sol
index 666747362..eaa55ffaa 100644
--- a/contracts/ownership/Ownable.sol
+++ b/contracts/ownership/Ownable.sol
@@ -10,7 +10,7 @@ contract Ownable {
   address public owner;
 
 
-  event OwnershipTransferred(address indexed newOwner);
+  event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);
 
 
   /**